What physical constraint defines the theoretical upper luminosity ceiling for conventional supernovae models?

Answer

The binding energy being greater than one-sixth of the Sun's rest mass energy

If the collapsing core's binding energy exceeds one-sixth of the Sun's rest mass energy, gravitational forces will cause the core to collapse directly into a black hole, bypassing the formation of a neutron star capable of powering a magnetar-driven explosion.

What physical constraint defines the theoretical upper luminosity ceiling for conventional supernovae models?
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